Drilling for oil

[russcc]

Thank you all for your posts, diagrams and photos. Couple of photos of the vertical drilling in the 59L block on the Bridgeport. #1 photo is the setup.
The 59L has a pronounced boss where the intersecting hole is drilled for the return. #2 photo. The head on the Bridgeport was tilted to drill that intersecting hole that is at an angle on the 59L. The last photo is a diagram of the drilled holes, and location of the set screw overlaid on the block photo.
There was some confusion between a 59 and 8BA block as to the location of the new return hole, and jig. A jig would have come in handy drilling the horizontal hole for the 3/8 pipe thread as that was a pain with the hand drill.